JPS5860662A - Dielectric ceramic composition for high frequency - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dielectric ceramic composition for high frequency use.

In high frequency regions such as microwaves and millimeter waves, dielectric ceramics are widely used for dielectric resonators, dielectric substrates for MIC, and the like.

Conventionally, as this type of dielectric magnet 83, ZrO2-8n
O2-TiO2-based material, Ba2Ti, O□. , (B
a%5r) (Zr-'I'i) Os yarn material,
Ba (Zn, Ta) 03-based materials are known. These materials have a microwave band tenoelectric constant (ε,)
It is an excellent material with the characteristics of 20 to 40, Q of 4000 to 8000 degrees, and a temperature coefficient (τf) of the resonance frequency of Oppm/-C, but recently the frequency range used has become even higher. Correspondingly, materials with even higher Q values are required.

Therefore, an object of the present invention is to provide a dielectric ceramic composition having a higher Q than the conventional one in a high frequency region.

That is, the gist of this invention is -〇, 02
≦Summer≦0, 13.0.28≦y≦0.33.0.59≦
However, 2≦0.65G! +7+1=1).

Hereinafter, this invention will be described in detail according to examples.

High purity 17) B, Ic01.8rCO,, ZrO2, N
iO,'l''a20s1, weighed so as to obtain porcelain having the composition shown in Table 1, wet-mixed the weighed raw materials for 2 hours, then calcined at 1200°C for 2 hours, and further added a binder. Then wet mix again for 2 hours, dehydrate, °
A porcelain sample was obtained by firing under C14 hour conditions.

Regarding the obtained ceramic sample, the dielectric constant (T) at a frequency of 7 GHz, Q, and the temperature coefficient of the resonance frequency (τf
) was measured and the results are shown in Table 1. Items marked with * in Table 1 are outside the scope of this invention, and all others are within the scope of this invention.

FIG. 1 also shows ZrO,
, Ni01Ta057. The composition range of Chive L'te is shown below. The numbers in the figure match the sample numbers in Table 1.

Table 1 Temperature coefficient (τf) of resonance frequency is +25°C to +85°C
This is the value obtained based on the following formula.

τf”−+τl−α where rE: Temperature change rate of permittivity (to) α: Expansion coefficient of porcelain sample As is clear from Table 1, the invention of Jin is as follows:
In addition to exhibiting a high dielectric constant, f is also good, and in particular, a value of up to 11,000 for Q has been obtained, making it a high-frequency product useful for applications such as dielectric resonators and dielectric substrates for MIC in the high-frequency region. It is possible to provide dielectric porcelain for.

Further, even if part of Ni is replaced with divalent ions such as fco, Fe, and Mg%Zn, a high frequency dielectric ceramic composition having similar characteristics can be obtained.

It should be noted that samples having compositions outside the scope of the present invention (sample numbers 10 to 11) cannot be sintered and cannot be put to practical use.

[Brief explanation of drawings]

Figure 1 shows ZrO□, Ni among the compositions according to this invention.
It is a ternary diagram showing the composition range for p, 4Tag, /. Patent applicant Murata Manufacturing Co., Ltd. 0.24 7' 2 bows

Claims (1)

[Claims] General formula (Ba1.5rv) (ZrxNi, 'l'a2)
In the composition represented by 07/2X72 m)'/2, 0≦V≦0.13.0.02≦X≦013.0.2
8≦y≦033.0.59≦2≦0.65 (Tagoshi,
A dielectric porcelain composition for high frequency use, characterized in that it has flaws in the range x+y+z=1).